ArHg +-ions in the mercury-argon low pressure discharge—mass spectrometric analysis of the formation process : G Franck et al,Proc of 11 th Internat Conf on Phenom in Ioniz Gases, Prague 1973, 10

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Resonant two-photon transitions from the 6 3PJ excited states of Hg I have been observed for the first time. The excited states of Hg I were generated in a low-pressure, mercury-dosed, hollow cathode discharge lamp; the two-photon transitions were stimulated using a pulsed dye laser and detected via the optogalvanic effect. Each of the three Hg I 6 3PJ→7 3PJ (ΔJ=0; J=0, 1, 2) transitions and the Hg I 6 3P2→8 3P2 transition were observed. The latter transition was used as the basis of experiments to map the spatial distribution of the 6 3P2 state in the discharge volume. Attempts to observe the two-photon excited LIF transition Hg I 8 3P2→7 3S1 at 690.7 nm in a hot cathode, low-pressure, mercury-argon discharge were unsuccesful.